Sulfur Chemistry Overview

Dimethyl Disulfide (DMDS)

Dimethyl Disulfide (DMDS) is the most commonly used chemical for the activation of hydrotreating and hydrocracking catalysts (a.k.a. sulfiding). These catalysts contain metal oxides that must be converted to the active metal sulfide prior to use. DMDS injection begins once the reactor reaches the proper temperature level, quickly decomposing to form the H2S needed to convert the oxides to sulfides.Learn More »

Dimethyl Sulfide (DMS)

Dimethyl Sulfide (DMS) is continuously injected into the steam cracking furnace section of an ethylene plant to inhibit coke formation and to control CO formation throughout the process.Learn More »

Tertiary Butyl Polysulfide (TBPS)

Tertiary Butyl Polysulfide (TBPS) is a mercaptan that can be used as a sulfiding agent to activate hydrotreating and hydrocracking catalysts. TBPS offers some advantages over DMDS for in-situ sulfiding, although the extra cost may outweigh the benefits. Learn More »